Growing Degree Days Tracker

GDD & Bloom Timing (GTS)

$2.99 · In‑App Purchases · Designed for iPad

Grassland Temperature Sum App – GTS & GDD Bloom Tracker The Grassland Temperature Sum (GTS) is a temperature-based indicator used to track seasonal development and blooming phases. It follows the same principle as Growing Degree Days (GDD), widely used in the US, and is especially well suited for early spring phenology. This app helps farmers, gardeners, beekeepers, and homesteaders understand when nature actually starts — based on accumulated heat, not calendar dates. With Grassland Temperature Sum, you can monitor temperature sums, track blooming progress, and compare seasonal development across multiple locations. Key Features • Automatic Location Detection Uses your location and regional weather data for accurate calculations. • Daily Updated Temperature Sums (GTS / GDD-based) Daily mean temperatures are accumulated from the beginning of the year. GTS is optimized for phenological development; GDD follows the standard growing degree day concept. • Bloom Calendar with Progress Indicator See which plants are currently blooming, about to bloom, or not yet active — ideal for tracking forage and nectar availability. • Monitor Multiple Locations • 1 location free • Up to 3 locations with annual subscription • Up to 10 locations with extended subscription Perfect for farms, apiaries, gardens, and homesteads. Why Temperature Sums Matter Temperature sums like GTS and GDD help assess how far the season has progressed: • Early, cold years develop slowly • Mild winters and warm springs advance bloom timing • Bloom and forage availability depend on accumulated heat, not dates Who Is This App For? • Farmers – Plan fertilization and field work based on temperature sums • Gardeners & Homesteaders – Time planting and seasonal tasks more reliably • Beekeepers – Track bloom timing of important nectar and pollen plants • Researchers & Consultants – Use temperature-based indicators for analysis Grassland Temperature Sum gives you a clear, location-based view of seasonal development — using GTS and GDD principles to help you make better timing decisions. Terms and conditions: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

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New: GDD (Growing Degree Days) tracking alongside GTS for clearer bloom timing. For existing users (who already used the app last year), the chart now also shows a subtle previous-year line.

The developer, Bernhard Hering, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Collected

    The developer does not collect any data from this app.

    Privacy practices may vary, for example, based on the features you use or your age. Learn More

    The developer has not yet indicated which accessibility features this app supports. Learn More

    • Seller
      • Bernhard Hering
    • Size
      • 2.4 MB
    • Category
      • Weather
    • Compatibility
      Requires iOS 18.0 or later.
      • iPhone
        Requires iOS 18.0 or later.
      • iPad
        Requires iPadOS 18.0 or later.
      • Mac
        Requires macOS 15.0 or later and a Mac with Apple M1 chip or later.
      • Apple Vision
        Requires visionOS 2.0 or later.
      • Apple Watch
        Requires watchOS 11.2 or later.
    • Languages
      English and 4 more
      • English, French, German, Italian, Spanish
    • Age Rating
      4+
    • In-App Purchases
      Yes
      • bis zu drei Standorte $1.99
      • Bis zu zehn Standorte $6.99
    • Copyright
      • © Bernhard Hering